Albert wilhele scemid



ALBERT WILHELDI SCHMID, OF BASEL, SWITZERLAND.

PROCESS FOR WEIGHTING OR CHARGING- SILK TO BE DYED BLACK.

1 Act? ,2'86.

No Drawing.

T 0 all 10 71cm it may concern Be it known that I, ALBERT VVILHELM SoHMIn, a citizen of the Swiss Republic, and resident of Basel, Switzerland, have invented a new and useful Process for Weighting or Charging Silk to be Dyed Black.

It is known that silk, silk waste and yarns and tissues, etc., of silk and silk waste, to bedyed deep black, are subjected first to the usual tin-phosphate weighting or charging process and weighted or charged afterwards in a hot haematein bath, to which an alkaline substance in form of soap, alkali-metal silicate, caustic soda, caustic potash, etc, has been added previously, this second charging o1 weighting laying simultaneously the ground-color. This process, which is now in common use in all silk dye-works, has the great advantage to produce a substantial increase of weight by the tin-phosphate weight ing process and to lay simultaneoiisly the ground for a deep-black tint. After the silk has been subjected to the said haematein-alkali bath, it is dyed, either in the same bath, which is completely. exhausted, or in a separate dyeing bath, with aniline dyes in order to obtain the deep black tint.

I have now tound, that this weighting or charging process with haematein can be shortened considerably, while essential technical advantages can be attained simultaneously, when in place of the hzematein-alkalibath, there is employed a boiling haemateinbath in form of a lather of troth bath. It is essential that in the new process the soap, alkali-metal silicate, caustic soda or caustic potash are replaced by sill: worm chrysalides previously boiled up. Thus the duration of the treatment, which was heretofore at least L2 hours, is shortened to IS -.0 minutes, may the treatment be a continuous one or be interrupted by a washing. At the same time there is obtained a saving of costs relatively to the process heretofore employed, for the reason that the chrysalides employed are in all cases cheaper that the alkalies previously employed. These chrysuvlides serve also to the formation of the lather or froth and therefore it is possible to add to the bath of haematein and chi vsalides small quantities of an alkaline substance as for instance an alkali-metal silicate, soda, etc.

The process can for instance be carried out as follows:

100 kg. of silk are suspended in a bath of boiling lather of froth, prepared with 2000 Specification of Letters Patent.

Application filed February 18, 199.2.

Patented May 23, 1922.

serial No. 527,537.

liters of water, 70 kg. of heematein and 20 kg. of chrysalides previously boiled up in 50 liters of water, the liquid bath being heated to produce boiling team or froth according to the well known process now generally used for the ungumming and the tin-plies phate weighting of silk. The silk is treated with this bath of boiling lather or froth for 15 to 30 minutes in a continuous process or in a process interrupted by a washing. 10 kg. of potassium silicate may, for instance, have been added to this bath. The exhaust ed bath can then be mixed with weak water and aniline dye and the silk can be dyed in the froth or lather of this aniline-dye bath or it can be dyed subsequently in a separate bath of aniline-dye. i

The advantages ot this new process are principally its shorter duration, the feeble Volume of the liquid bath employed, the avoidance of any impairing of the silk, the obtaining of smooth stretched threads and the obtaining of high charging or weighting. lVhat I claim is: i l

1. The herein described process for weighting or charging silk, to be dyed black. consisting in first weighting or charging silk according to the usual tin-phosphate process and treating it afterwards in a boiling lather or froth bath of a hu-nnatein solution to which'chrysalides boiled up in water have been added.

2. The herein described process for weighting or charging silk, to be dyed black, consisting in first weighting or charging silk according to the usual tin-phosphate process and treating it afterwards in a boilin lather or froth bath of a hzematein solution to which an alkaline substance and chrysalides boiled up in water have been added.

The herein described process For weighting or charging silk, to be dyed black, consisting in first weighting or charging silk according to the usual tin-phosphate process and treating it afterwards in a boiling lather or froth bath of a hannatein solution to which an alkali-metal silicate and chryszu lides boiled up in water have been added in witness whereof I have hereunto signed my name this 13th day of January 1922, in the presence oi. two subscribing witnesses.

ALBERT lVILHELM SCHMID.

lVitnesses FRIDA Runs,

ARMAND BITTER. 

